• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The aim of this investigation is to determine the concentration of Limewater.

Extracts from this document...

Introduction

Orehra Mahmood- Limewater practical. Aim: The aim of this investigation is to determine the concentration of Limewater. Plan: I am required to find the concentration of a sample of Limewater solution in g dm3 Ii is vital for me to design my own experiment and choose a range of appropriate equipment and apparatus. I am provided with 250 cm3 of Limewater, which has been made such that it contains approximately 1g dm3 of calcium hydroxide. Also available is hydrochloric acid, which has a concentration of 2.00 mole dm3, however this concentration is too much though, so it is necessary to dilute it to an appropriate diluted volume. The indicator will be supplied to me-, which is known as methyl orange. Slaked lime dissolved in water is called Limewater. Calcium oxide reacts violently with water to produce calcium hydroxide (slaked lime) Addition of further water to Calcium hydroxide produces the saturated aqueous solution known as Limewater. In order for me to establish the concentration of the Limewater it is necessary to react the Hydrochloric acid with the Limewater. ...read more.

Middle

So if I were to use the phenolphthalein indicator then the end point (colour change) would be reached before the equivalence point (when the chemicals, acid-base break up). Calculations:- In order to work out the amount of molar of acid I will require to carry out some calculations. I need to work out how much I will need to dilute the acid until it is at the appropriate dilution for my investigation. Here are the calculations that I carried out to work out the dilution I required for my acid:- Moles = mass/molar weight (Mr)= 1gdm-3. Ca (oh) 2 40+ (16 +1) x2 =40+ 34 =74g =1gdm- 3/ 74g/ mol =0.0135 mol/ dm-3 = 25 x 0.0135/ 1000 = 0.00034 mols. Ca (OH)2 + HCL - CaCl2 + 2H20. Balance the equation above to get--- 1 mol of Ca (OH) 2 = 2 mols of HCL. 0.00034 x 2 = 0.0007 mols. Mols = volume / 1000 x morality, Morality = mols x 1000 / volume. ...read more.

Conclusion

I want to dilute the acid to 0.1 moles, so I pipette 25.0cm3 of HCl from the original bottle and place it in the 500cm3 volumetric flask. Then I add 475cm3 of distilled water to the same volumetric flask, I measure the amount of water by looking at the graduated mark on the flask and fill until the 500cm3 mark. Once I have obtained the correct concentration of Hydrochloric acid I can precede to the rest of the experiment. First I must set up the apparatus as I have indicated in my diagram. I will be using 25.0cm3 of Limewater and I will transfer it into the conical flask using a 25.0cm3 pipette. It is also important to add the indicator into the conical flask so that the neutralisation point can be obtained, where five drops of methyl orange should be appropriate. When the indicator is added the colour of the solution is light, clear, orange and this should turn to pink by the end of the titration. In order to obtain consistent and reliable results it is necessary to repeat the experiment several times. After this it the results must be noted in a table ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Aqueous Chemistry essays

  1. Marked by a teacher

    Enthalpy of Neutralisation.

    3 star(s)

    1000 ?H = 1646.4 J 0.025 = 65856mol -1 To convert to Joules = 65856 J 1000 = -65.86 Kj mol -1 Note: I used 0.025 moles because 0.05 moles was not the value I got for the neutralisation point and I did not use 50cc to neutralise it.

  2. Antacid Investigation.

    This is to protect eyes from any strong acids getting in them. Also make sure the test is being conducted under eyelevel this is mainly because the reason above. Another issue of safety is that it is very important to be careful when pouring the HCl if it does get

  1. How much Iron (II) in 100 grams of Spinach Oleracea?

    Volumetric Flask = 0.2 X 100 = 0.08 % 250 Potassium Manganate (VII) in 50 cm3 burette = 0.005 X 100 = 0.02290426 % 21.83 Spinach Extract solution in a 20 cm3 pipette = 0.05 X 100 = 0.25 % 20 Spinach Extract solution in a 10 cm3 pipette =

  2. Reactivity Series Investigation

    Get medical attention. Wash clothing before reuse. Thoroughly clean shoes before reuse. If calcium powder gets into your eyes then Immediately flush eyes with plenty of water for at least 15 minutes, lifting lower and upper eyelids occasionally. Get medical attention immediately.Magnesium is also a dangerous metals so do not swallow,make contact with eyes,get it on skin

  1. Determine the concentration of lime water.

    The pipette that I was using was holding back some of the solution each time but I dispersed of this by blocking of the top end and wrapping my hand around the pipette, warming the interior slightly and pushing the drop out. Some errors are likely to come from measurements.

  2. The aim of this experiment is to determine as accurately as possible the concentration ...

    I will invert the flask 2-3 times, mixing the hydrochloric acid and distilled water together.

  1. To determine the concentration of Limewater solution

    (Dilution calculation) Ca(OH)2(aq) + 2HCl(aq) CaCl(aq) + 2H2O(L). You must see that the limewater solution contains around 1g mol dm-3 of calcium hydroxide. We need to convert the grams into mol dm-3 because the concentration of the HCl is in mol dm-3 .

  2. The aim of my experiment is to find the exact concentration of limewater. In ...

    + 10cm3 (HCl) = 1000cm3 Now the solution is 100 x more dilute therefore meaning that the concentration of the acid within the diluted solution is 0.02M. Indicator... To carry out this experiment I need to use an indicator. The following indicators can be used for my experiment: * Litmus

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work